Screw driver



Dec. 4 1923. 1,476,553

J. R. STANTON I SCREW DRIVER Filed May 17 1922 'I/WENTOR.

' ATTORNEY.

Patented Dec. 4, i923.

U T IT E 4- me osis JOSEPH B. STANTON, OF NEWBURYPORT, MASSACHUSETTS.

SCREW DRIVER.

Application filed May 17, 1922.' Serial No. 561,640.

and more particularly to this class of inc-- plenients for use in connection with specially constructed screw heads.

The primary object of the invention is the provision of a screw driver of this character wherein the bit end thereof is of a particular formation so that when engaged in the head of a screw of special construction will be prevented from accidentally slipping out from the nick of the screw during the operation of turning the latter in or out of a piece of work, the specially constructed screw head being disclosed in an application for U. S. Letters Patent filed y me on or about April 7,1922, bearing Serial Number 550,436.

A further object of the invention is the provision of a screw driver of this character, which is extremely simple in construction, thoroughly reliable and eflicient in its purpose strong, durable and inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts, as will be hereinafter more. fully described, illustrated in the accompanying drawings and pointed out in the claims hereunto appended.

In the accompanying drawings Fig. 1 is a fragmentary side elevation of the screw driver constructed in accordance with the invention. I

Fig. 2 is an end elevation thereof.

Figure 3 is a top plan view of a screwhead provided with a groove of the type necessary for use with said screw driver.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in detail, there is shown a screw driver designated generally at A for-use in driving fasteners, specially constructed and an example of this fastener being disclosed in an application for U. S. patent filed by me on or about April 7, 1922, and bearing Serial Number 550,436. This screw driver is formed with a blade 11, having cut or pressed therein in opposite faces, substantially triangular shaped recesses 12 to provide at the free edge of the blade 11, a tip 13, having its outer end in one lateral plane-and'its contour at the side thereof shaped correspondingly so as to present the side walls with reversely bevelled faces 14 on opposite sides of the medial or intermediate point of the tip 13 so that this medial portion'wi ll be restrictedat 15 and the bevelled faces 14.1

diverging outwardly therefrom, whereby the tip orbit end 13 of the screw driver when engaged in a corresponding nick-or slot in the head of a screw will be firmly anchored therein and prevented from lateral displacement or relative movement with respect to said screw driver and screw, thus enabling the turning of the screw to work the same home into a piece of work or the convenient removal of said screw from'the latter, without possibility of the screw driver slipping accidentally out of the slot.

From the foregoing, it is thought that the construction and manner of use of-the screw driver Will be clearly understood and therefore a more extended explanation has been omitted.

In Fig. 3 is shown a top plan view of a screw head 16, provided with a transverse groove 17, which groove is constricted at its central portion 18, to correspond to" the contour of the end of the screw driver.

What is claimed is z? i w 1. A screw driver of the character described, comprising a one-piece handle and a bit combined, with the bit having recesses on opposite faces each of angularly, bevelled, tapered contour extending from a median longitudinal line and diverging outwardly to the side edges with the latter defining the longitudinal line and widening outwardly to the side edges, with the latter defining the thickest portions of'the bit, whereby to closely fit corresponding slots in a screw 5 head and thus avoiding slipping between the bit and the screw kerf during the operation of rotating the screw,the bit having emme the recesses progressivelydecreesing in relative angular relation to adapt the bit to the screw head kerf of dillerent extents. 10

In testimony whereof, I'afiix my signature hereto.

JOSEPH STANTQN. 

